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Entity–relationship model
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=== Extension model === An extensional model is one that maps to the elements of a particular methodology or technology, and is thus a "platform specific model". The UML specification explicitly states that associations in class models are extensional and this is in fact self-evident by considering the extensive array of additional "adornments" provided by the specification over and above those provided by any of the prior candidate "semantic modelling languages".[http://www.tdan.com/view-articles/8589 "UML as a Data Modeling Notation, Part 2"]
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